COMMUNICATIONSDispositif SAFETY of monitoring ready to be installed in a real estate, including/understanding average ded閠ection of events and means of treatment ready to generate orders of at least a organede reaction to the events characterized by the fact that it comprises a network (6) of modules (1, 2, 3, 4) co-operating and not hierarchical including/understanding each means of processing (8) the data of d閠ectionet of the means of communication interns (9) configured to exchange data of monitoring between lesmodules. The invention also relates to an installation of monitoring including/understanding several of these devices.